From patchwork Fri Mar 10 07:00:39 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zheng Wang X-Patchwork-Id: 67242 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:5915:0:0:0:0:0 with SMTP id v21csp726291wrd; Thu, 9 Mar 2023 23:11:39 -0800 (PST) X-Google-Smtp-Source: AK7set9qRlgzJO9A2jL51r0s10l28bLGMuGGiVNRl1+jcb4dBYAsrIiNK9yFIjG/gRiT7yByfYBI X-Received: by 2002:a05:6a20:1613:b0:c7:60d1:81a1 with SMTP id l19-20020a056a20161300b000c760d181a1mr28763630pzj.28.1678432298708; Thu, 09 Mar 2023 23:11:38 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1678432298; cv=none; d=google.com; s=arc-20160816; b=r2bw3mf6A7h/y1sOD/03aLL7M9e27j9YWRVlWfqNRPbq022ejELLIJIL7s+uSAQtPw NVHQyhG19uX43TaH1mDQLDJ/v7JQMX9nsqUQ70O0TfajSTuQDJPTQqd8fwxgNCKM26yR 94aPmJ5VqMpyyEfKyrEYRfezKdvjfJjbMTgaC/kN0bRg2xKb9P3FWCXYtJyFLmxh0FEv apTK+q5SkRZcPfh7mk78ZljOtu3HrTlpDMJNjaBNPp5mzPbUzD39uNnsXtn/222+52+b YVB/KTFeqXvttTUjggME2v8RujHaV9oMN/pkNqtnA7LZiWc/d65xQBflLo1hqFIP510Q C9FA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :message-id:date:subject:cc:to:from:dkim-signature; bh=1z6vhFR7cbq9745C+sXleDgCeGXWCt5kCHk83K/xDew=; b=osBauaKzzu5rmYGDU69LC7QYmQlAO954XOyLaCkYw/wNePMAR1zip+JhmAcH07VTXA oVTbG60tOW2Dc+MLNpLfiJs9lFWL06FfW+b63rxpZ2M40FO3mFUCN976xGF/8pM62lFW Kr/BVv6CRtcspIha+z4GqV+ibq+D62imOQxg+aQWSMLmuK9HdKsv0vAOYvrT+/6CqKHZ 6wgJNopZMO1Osny9DzVvTZwIyt80RM8pT0T9gfE0XNhxw6OT5ezXYZ5z/cEEoq/q8K24 Md/zKiy5qQQsoJ1UOE9ZRhPh5ZykF7N/ttHdgnPeuc1sa+bB6BS8PsOJGsoP5khl2IiF U7Eg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@163.com header.s=s110527 header.b=g12hMjc8; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=163.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id w8-20020a63f508000000b005030925d306si1241272pgh.765.2023.03.09.23.11.23; Thu, 09 Mar 2023 23:11:38 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@163.com header.s=s110527 header.b=g12hMjc8; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=163.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229844AbjCJHA7 (ORCPT + 99 others); Fri, 10 Mar 2023 02:00:59 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33210 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229453AbjCJHAz (ORCPT ); Fri, 10 Mar 2023 02:00:55 -0500 Received: from m12.mail.163.com (m12.mail.163.com [123.126.96.234]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id D31BFF98D1; Thu, 9 Mar 2023 23:00:53 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:Subject:Date:Message-Id:MIME-Version; bh=1z6vh FR7cbq9745C+sXleDgCeGXWCt5kCHk83K/xDew=; b=g12hMjc84NJkh25h4Bx4j eRcKL/ZdqZd/QifDOK3nYCjtS29tiB/UYY7jLztIQIgRxI/YQ0w9tpoTiCIg9WCP RdjIQL/yQdq6ZUsojVgCPkBU6ZQLGKPQnIk11zZah+JvzxZ+qbWY/lw+u78wS7dI g07JxS15B5UHuG0gIUc3d0= Received: from leanderwang-LC2.localdomain (unknown [111.206.145.21]) by smtp17 (Coremail) with SMTP id NdxpCgCHoGqY1Qpk6BJXHA--.82S2; Fri, 10 Mar 2023 15:00:40 +0800 (CST) From: Zheng Wang To: gregkh@linuxfoundation.org Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, hackerzheng666@gmail.com, 1395428693sheep@gmail.com, alex000young@gmail.com, Zheng Wang Subject: [PATCH] USB: gadget: udc: Fix use after free bug in udc_plat_remove due to race condition Date: Fri, 10 Mar 2023 15:00:39 +0800 Message-Id: <20230310070039.1288927-1-zyytlz.wz@163.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-CM-TRANSID: NdxpCgCHoGqY1Qpk6BJXHA--.82S2 X-Coremail-Antispam: 1Uf129KBjvJXoW7ArykXw4xZF4rXr1kCF13XFb_yoW8GF47pF Z3KrWxGr4DAryqyr17Gr1rZFW8Ca9rKr95KrW2k3W3Zrn5Kw43ArW8JF1fKF4xJF97ArWa qF4v9r10vFWkua7anT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0ziJUU8UUUUU= X-Originating-IP: [111.206.145.21] X-CM-SenderInfo: h2113zf2oz6qqrwthudrp/xtbBzgAuU2I0XlsmAwAAsF X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1759963825942604426?= X-GMAIL-MSGID: =?utf-8?q?1759963825942604426?= In udc_plat_probe, &udc->drd_work is bound with udc_drd_work. udc_drd_work may be called by usbd_connect_notify to start the work. Besides, there is a invoking chain: udc_plat_probe ->udc_probe ->usb_add_gadget_udc_release ->usb_add_gadget It will add a new gadget to the udc class driver list. In usb_add_gadget, it uses usb_udc_release as its release function, which will kfree(udc) to when destroying the gadget. If we remove the module which will call udc_plat_remove to make cleanup, there may be a unfinished work. The possible sequence is as follows: Fix it by finishing the work before cleanup in the udc_plat_remove Fixes: 1b9f35adb0ff ("usb: gadget: udc: Add Synopsys UDC Platform driver") Signed-off-by: Zheng Wang --- drivers/usb/gadget/udc/snps_udc_plat.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/usb/gadget/udc/snps_udc_plat.c b/drivers/usb/gadget/udc/snps_udc_plat.c index 8bbb89c80348..6228e178cc0a 100644 --- a/drivers/usb/gadget/udc/snps_udc_plat.c +++ b/drivers/usb/gadget/udc/snps_udc_plat.c @@ -230,6 +230,7 @@ static int udc_plat_remove(struct platform_device *pdev) struct udc *dev; dev = platform_get_drvdata(pdev); + cancel_delayed_work_sync(&dev->drd_work); usb_del_gadget_udc(&dev->gadget); /* gadget driver must not be registered */